CERN Accelerating science

All CERN Accelerators documents

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2019-09-21
06:01
Characterisation of the radiation hardness of cryogenic bypass diodes for the HL-LHC inner triplet quadrupole circuit / Wollmann, Daniel (CERN) ; Bernhard, Axel (KIT, Karlsruhe) ; Cangialosi, Chiara (CERN) ; Cerutti, Francesco (CERN) ; D'Angelo, Giorgio (CERN) ; Danzeca, Salvatore (CERN) ; Denz, Reiner (CERN) ; Favre, Mathieu (CERN) ; Garcia Alia, Ruben (CERN) ; Hagedorn, Dietrich (CERN) et al.
The powering layout of the new HL-LHC Nb$_3$Sn triplet circuits is the use of cryogenic bypass diodes, where the diodes are located inside an extension to the magnet cryostat, operated in superfluid helium and exposed to radiation. Therefore, the radiation hardness of different type of bypass diodes has been tested at low temperatures in CERN’s CHARM irradiation facility during the operational year 2018. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-THPTS067 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.THPTS067

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2019-09-21
06:01
Beam impact experiment of 440GeV/p protons on superconducting wires and tapes in a cryogenic environment / Will, Andreas (KIT, Karlsruhe ; CERN) ; Bastian, Yan (CERN) ; Bernhard, Axel (KIT, Karlsruhe) ; Bonura, Marco (U. Geneva (main)) ; Bordini, Bernardo (CERN) ; Bortot, Lorenzo (CERN) ; Favre, Mathieu (CERN) ; Lindstrom, Bjorn (CERN) ; Mentink, Matthijs (CERN) ; Monteuuis, Arnaud (CERN) et al.
The superconducting magnets used in high energy particle accelerators such as CERN’s LHC can be impacted by the circulating beam in case of specific failure cases. This leads to interaction of the beam particles with the magnet components, like the superconducting coils, directly or via secondary particle showers. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-THPTS066 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.THPTS066

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2019-09-21
06:01
Alternative proposal for FCC-hh extraction septa / Sanz Ull, Alejandro (CERN ; Eindhoven, Tech. U.) ; Atanasov, Miroslav (CERN) ; Balhan, Bruno (CERN) ; Borburgh, Jan (CERN)
Challenging requirements are set for the FCC extraction septa magnets, notably for the magnetic field level, the septum thickness and the leak field. An alternative to the baseline FCC extraction layout is proposed, consisting of a Superconducting Shield (SuShi) stage and a Truncated Cosine $\theta $ (TCT) septa stage with the aim of reducing the required number of septa and installed length. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-THPTS062 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.THPTS062

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2019-09-21
06:01
Active lower order mode damping for the four rod LHC crab cavity / Dexter, A C (Lancaster U. (main) ; Cockcroft Inst. Accel. Sci. Tech.) ; Burt, G (Lancaster U. (main) ; Cockcroft Inst. Accel. Sci. Tech.) ; Apsimon, R (Lancaster U. (main) ; Cockcroft Inst. Accel. Sci. Tech.)
The high luminosity upgrade planned for the LHC requires crab cavities to rotate bunches into alignment at the interaction points. They compensate for a crossing angle near 500μrad . [...]
2017 - 10 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 844 (2017) 62-71 Fulltext from publisher: PDF;

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2019-09-20
15:18
Single-sided collimation and the effects on beam cleaning and impedance in the LHC / Kodjaandreev, Dimitr Petkov (University of Malta (MT))
The Large Hadron Collider (LHC) employs a multistage collimation system to protect against unavoidable beam losses during operation. A regular collimator consists of two movable blocks placed symmetrically around the circulating beam in order to intercept halo particles. [...]
CERN-THESIS-2019-128.- 160 p. Fulltext: PDF; External link: Approve this document (restricted)

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2019-09-20
13:36
TT20 beam loss reduction / Tat, Duy-Martin (University of Oxford)
The beam losses at the TT20 beam splitter are studied and different schemes for reducing these losses are performed. [...]
CERN-STUDENTS-Note-2019-219.
- 2019.
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2019-09-20
08:41
The ATLAS multi-user upgrade and potential applications / Mustapha, B (Argonne, PHY) ; Nolen, J A (Argonne, PHY) ; Savard, G (Argonne, PHY) ; Ostroumov, P N (Michigan State U., East Lansing (main))
With the recent integration of the CARIBU-EBIS charge breeder into the ATLAS accelerator system to provide for more pure and efficient charge breeding of radioactive beams, a multi-user upgrade of the ATLAS facility is being proposed to serve multiple users simultaneously. ATLAS was the first superconducting ion linac in the world and is the US DOE low-energy Nuclear Physics National User Facility. [...]
2017 - 11 p. - Published in : JINST 12 (2017) T12002

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2019-09-19
16:25
A VdM Sequence File Web Application / Hickman, Thomas Kendall ; Marqversen, Frederik Kofoed ; Calia, Andrea (CERN) ; Hostettler, Michi (CERN)
To perform Van der Meer scans at the LHC, the experimental collaborations have to supply a text file containing a command sequence specifying the beam positions required. [...]
CERN-ACC-NOTE-2019-0038.
- 2019.

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2019-09-19
11:31
Studies of PACMAN effects in the HL-LHC / Ribes Metidieri, Ariadna (University of Barcelona (ES)) ; Buffat, Xavier (CERN)
This note summarises the status of the studies on PACMAN beam-beam effects in the HL-LHC project. [...]
CERN-ACC-NOTE-2019-0037.
- 2019. - 34 p.
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2019-09-19
09:30
A VdM Sequence File Web Application (report) / Marqversen, Frederik Kofoed ; Hickman, Thomas Kendall
To perform Van der Meer scans at the LHC, the experimental collaborations have to supply a text file containing a command sequence specifying the beam positions required. [...]
CERN-STUDENTS-Note-2019-210.
- 2019.
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